High-speed bolt diestock



Much 1943. 1. WHI TFIELD I 2,313,415

HIGH SPEED BOLT DIE'S'ITOCK I Filed Sept. 7, 1942 3 Sheets-Sheet 1 March9, 1943. l, WHITFIELD 2,313,415

HIGH SPEED BOLT DIE STOCK Filed Sept. 7. 1942' s Sheets -Sheet 2 March 91943.

-l. WH ITFIELD HIGH SPEED BOLT DIE STOCK Filed Sept. 7, 1942 3Sheets-Sheet s jaw/0111 0 1 I Patented Mar. 9, 1943 UNiTED STATES rearother.

BIIGIBSPEED BOLT DIESTOCK Ira W'Jhitfield, Boston, Mass.

Application September 7, 1942, Serial No. 457,608

4 Claims.

The invention relates to improvements in die stocks, and moreparticularly to a high speed; self-oiling die stock for threading pipes,rods, and the like, and the primary object of the invention is toprovide a more efiicient and practical device of this character whichsubstantially reduces the amount of labor required while speeding up thework.

Other important objects and advantages of the invention will be apparentfrom a reading of the following description taken in connection with theappended drawings, wherein for purposes of illustration a preferredembodiment of the invention is shown.

In the drawings:

Figure 1 is a fragmentary front elevational view of the embodiment.

Figure 2 is a top plan view of Figure 1.

Figure 3 is a fragmentary enlarged'transverse sectional view takenthrough Figure 1 along the line 3-3 and looking downwardly in thedirection of the arrows.

Figure 4 is an enlarged transverse vertical sectional View taken throughFigure 1 along the line 4-4 and looking toward the left in the directionof the arrows.

Figure 5 is an enlarged fragmentary transverse sectional view takenthrough Figure 2 along the line 55 and looking in the direction of thearrows.

Figure 6 is an enlarged side elevational view of one of the oil pumps.

Figure 7 is a transverse vertical sectional View taken through Figure 6along the line 1-1 and looking in the direction of the arrows.

Referring in detail to the drawings, the numeral 5 generally designatesthe main body of the die stock, which has a generally conventionalelongated form including tapered sockets 6 and l at its opposite ends inwhich the pipe handles 8 and 9 are threaded. The bore 10 of the socket5' has communication with the hollow interior oil reservoir II, with ascreen I2 mounted at the point of communication, and the end of the pipe8 is closed as indicated by the numeral l3, thereby forming a stopperfor the filling opening de fined by the bore iii of the socket 6. Thebore of the socket l is closed oif at its inner end by the wall M, theonly path of escape of the oil from the reservoir H being through theoil feeders to be described, except when the stopper pipe 8 is withdrawnto open position.

A hollow cylindrical portion l5 extends across the middle and center ofthe body 5 from side to side, and a guide ring 16 having the groovedperiphery I? is mounted in one end'of the bore l8 of the cylindricalpart l5, the guide ring I6 being held in place by radial contact by theinner end of a bolt l9 which is threaded through the wall of the body 5as indicated in Figure 5 of the drawings.

On the opposite face of the body 15 are supported the die plates [9 and2| which are similar in formation and arrangement and are of thegenerally conventional type, the same being slidable toward and awayfrom each other in a longitudinal channel 22 formed in the side of thebody 5, the plates having elongated slots 23 through which pass studs 24threaded in the side of the body 5 and provided with washers 25 whichare clampable against the outside of the plates by the bolts 26 in awell known manner to maintain adjusted positions (if the plates. Feedbolts 21 working in blocks 28 on the side of the body' 5 are used toadjust the plates 20 and 2| toward and away from each other. The cuttingteeth 29 arranged in pairs on the opposite horns of the apertures 30 inthe inner ends of the plates are fed with oil in accordance with thepresent in vention by small tubes 3| provided at longitudinal intervalswith small openings 32 and extending in notches 33 formed in theopenings 38 as indicated in the drawings.

The oil feed tubes 3| extend close to the sides of the bore N3 of thecylindrical part l5 and have longitudinally outwardly directed portions34 which are threaded in the opposite sides of the cylindrical portionI5 and have communication with the longitudinally inward ends of the oilpumps 35 and 36 which have internally restricted end portions 31threaded in the side wall of the cylindrical portion l5 in communicationwith the oil fed tubes as clearly shown in FigureB of the drawings. Thecenter opening I6 of the guide ring I6 is axially aligned with thecenter of the space between the said cutting teeth 29, as required foraccurate and uniform work.

} Each oil pump comprises an elongated tube having a relatively shortimperforate portion 38 and a relatively long circumferentially slottedportion 39 whose slots are in communication with the oil reservoir H.The outer end of the slotted portion 39 terminates in a funnel portion48 which has at its wide end a convex closure wall 4!. Within the pumpsare free steel balls 42. Oil entering through the slots in the pump onthe reservoir I l is forced in a radially inward direction through theimperforate portion 38 into the corresponding feed tube 3| as thecorresponding side of the die stock is elevated and the correspondingball 42 falls by gravity through the pump, so that oil is fed from thesmall openings 32 in the oil feed tube to the region of the cutters 29,whereby the region of the cut being made on the rod or pipe is keptcooler and the operation of cutting threads thereon is speeded up,whereby the cutting is facilitated and greater ease in operating the diestock as a whole is procured due to reduction of heat and friction.

In one side of the body 5 in laterally spaced relation to' thecylindrical portion I5 is an air tube and trap 43 which has a straightportion traversing the wall of the body 5 as indicated in Figure 5 ofthe drawings and communicating with the outside atmosphere, the saidstraight portion extending across the reservoir II to a point on theopposite side of the pump 35 where it is curvedly bent as indicated bythe numeral 44 in a radially inward direction with respect to thecylindrical portion I5, whence it is bent in a semi-circular form asindicated by the numeral 45 in the opposite direction. The tube 43 iscurved and gauged inside to predetermine the amount of outside air whichit will admit into the reservoir ll, so that oil can be fed from thereservoir l I through the feed tubes 3i without inhibition by vacuumwithin the reservoir which would otherwise obtain. The tube 43 is soarranged that in the ordinary operation of the die stock no oil from thereservoir II can escape through the tube 43.

In accordance with the present invention the pipe 9 instead of being thestraight usual type has a laterally deflected crank portion 45 on whicha suitable handle 41 is mounted. The worker can grasp the handle 41 andliterally spin the die stock on the work 48, making complete revolutionswithout any necessity of changing hands from one pipe 8 to the otherpipe 9, and vice versa, as is now necessary in the operation of diestocks, thereby greatly speeding up the work. Such high speed operationof the die stock is made possible by the lubrication supplied by the oilfeed arrangement described. 7

Although there is shown and described herein a preferred embodiment ofthe invention, it is to be definitely understood that I do not desire tolimit the application of the invention thereto except as may be requiredby the scope of the sub joined claims.

Having described the invention, what is claimed as new is:

l. A high speed die stoc" comprising a hollow elongated body composingan oil reservoir, a

transverse tubular portion extending across said r body and opening atits opposite ends through the opposite sides of said body, a work guideon said body at one end of said tubular portion and to force oil fromthe reservoir into said oil feed tubes and onto the thread cuttingteeth.

2. A high speed die stock comprising a hollow elongated body composingan oil reservoir, a transverse tubular portion extending across saidbody and opening at its opposite ends through the opposite sides of saidbody, a work guide on said body at one end of'said tubular portion andplates having thread cutting teeth on said body at the opposite end ofsaid tubular portion, oil feed tubes extending along the interior ofsaid tubular portion and reaching the region of the thread cuttingteeth, and pumps radiating from said tubular portion and havingcommunication at their inward ends with said oil feed tubes, said pumpshaving gravity operated elements effective upon rotation of the diestock on the work to force oil from the reservoir into said oil feedtubes and onto the thread cutting teeth, and air inlet means for saidreservoir for admitting air to displace oil pumped from the reservoir.

3. A high speed die stock comprising a hollow elongated body composingan oil reservoir, a transverse tubular portion extending across saidbody and opening at its opposite ends through the opposite sides of saidbody, a work guide on said body at one end of said tubular portion andplates having thread cutting teeth on said body at the opposite end ofsaid tubular portion, oil feed tubes extending along the interior ofsaid tubular portion and reaching the region of the thread cuttingteeth, and pumps radiating from said tubular portionand havingcommunication at their inward ends with said oil feed tubes, said pumpshaving gravity operated elements effective upon rotation of the diestock on the work to force oil from the reservoir into said oil feedtubes and onto the thread cutting teeth, said pumps each comprising atube having an imperforate portion communicating with a correspondingoil feed tube and an apertured portion, and a gravity operated elementfree within the tube.

4. A high speed die stock comprising a hollow elongated body composingan oil reservoir, a

transverse tubular portion extending across said plates having threadcutting teeth on said body at the opposite end of said tubular portion,oil feed tubes extending along the interior of said tubular portion andreaching the region of the thread cutting teeth, and pumps radiatingfrom said tubular portion and having communication at their inward endswith said oil feed tubes, said pumps having gravity operated elementseffective upon rotation of the die stock on the work body and opening atits opposite ends through the opposite sides of said body, a work guideon said body at one end of said tubular portion and plates having threadcutting teeth on said body at the opposite end of said tubular portion,oil feed tubes extending along the interior of said tubular portion andreaching the region of the thread cutting teeth, and pumps radiatingfrom said tubular portion and having communication at their inward endswith said oil feed tubes, said pumps having gravity operated elementseffective upon rotation of the die stock on the work to force oil fromthe reservoir into said oil feed tubes and onto the thread cuttingteeth, handles connected to the oppostie ends of said body and extendingin longitudinal alignment therewith, at least one of said handles havinga laterally directed crank handle facilitating rotation of the die stockon the work with one hand on said crank handle.

IRA WHITFIELD.

